iMX8MP HFP with Pulseaudio Routings

[Wobaffet]

Hello, 

We are trying to utilze HFP on our custom board with i.MX8MP, TLV320AIC3100 audio codec and AW-CM358 wifi-bt module with NXP 88W8987. 

We can utilize A2DP when both our custom board as sink and source. We've tested our mic which is working we are able to record audio with it. 

We can utilize calls via ofono, however we can't receive or transmit any sound for HFP. Here is our card info and loopback modules for pulseaudio:

Card #0
	Name: alsa_card.platform-sound-bt-sco
	Driver: module-alsa-card.c
	Owner Module: 6
	Properties:
		alsa.card = "1"
		alsa.card_name = "bt-sco-audio"
		alsa.long_card_name = "bt-sco-audio"
		device.bus_path = "platform-sound-bt-sco"
		sysfs.path = "/devices/platform/sound-bt-sco/sound/card1"
		device.form_factor = "internal"
		device.string = "1"
		device.description = "Built-in Audio"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card"
	Profiles:
		input:mono-fallback: Mono Input (sinks: 0, sources: 1, priority: 1, available: yes)
		output:mono-fallback: Mono Output (sinks: 1, sources: 0, priority: 100, available: yes)
		output:mono-fallback+input:mono-fallback: Mono Output + Mono Input (sinks: 1, sources: 1, priority: 101, available: yes)
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
	Active Profile: output:mono-fallback+input:mono-fallback
	Ports:
		analog-input: Analog Input (type: Analog, priority: 10000, latency offset: 0 usec, availability unknown)
			Part of profile(s): input:mono-fallback, output:mono-fallback+input:mono-fallback
		analog-output: Analog Output (type: Analog, priority: 9900, latency offset: 0 usec, availability unknown)
			Part of profile(s): output:mono-fallback, output:mono-fallback+input:mono-fallback

Card #1
	Name: alsa_card.platform-sound-tlv320aic31xx
	Driver: module-alsa-card.c
	Owner Module: 7
	Properties:
		alsa.card = "0"
		alsa.card_name = "tlv320aic31xx-Codec"
		alsa.long_card_name = "tlv320aic31xx-Codec"
		device.bus_path = "platform-sound-tlv320aic31xx"
		sysfs.path = "/devices/platform/sound-tlv320aic31xx/sound/card0"
		device.form_factor = "internal"
		device.string = "0"
		device.description = "Built-in Audio"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card"
	Profiles:
		input:stereo-fallback: Stereo Input (sinks: 0, sources: 1, priority: 51, available: yes)
		output:stereo-fallback: Stereo Output (sinks: 1, sources: 0, priority: 5100, available: yes)
		output:stereo-fallback+input:stereo-fallback: Stereo Output + Stereo Input (sinks: 1, sources: 1, priority: 5151, available: yes)
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
	Active Profile: output:stereo-fallback+input:stereo-fallback
	Ports:
		analog-input: Analog Input (type: Analog, priority: 10000, latency offset: 0 usec, availability unknown)
			Part of profile(s): input:stereo-fallback, output:stereo-fallback+input:stereo-fallback
		analog-output-speaker: Speakers (type: Speaker, priority: 10000, latency offset: 0 usec, availability unknown)
			Properties:
				device.icon_name = "audio-speakers"
			Part of profile(s): output:stereo-fallback, output:stereo-fallback+input:stereo-fallback

Card #3
	Name: bluez_card.DC_C4_9C_37_BB_0D
	Driver: module-bluez5-device.c
	Owner Module: 31
	Properties:
		device.description = "Gencay adlı kişiye ait S24"
		device.string = "DC:C4:9C:37:BB:0D"
		device.api = "bluez"
		device.class = "sound"
		device.bus = "bluetooth"
		device.form_factor = "phone"
		bluez.path = "/org/bluez/hci0/dev_DC_C4_9C_37_BB_0D"
		bluez.class = "0x5a020c"
		bluez.alias = "Gencay adlı kişiye ait S24"
		device.icon_name = "audio-card-bluetooth"
		bluetooth.codec = "mSBC"
	Profiles:
		a2dp_source: High Fidelity Capture (A2DP Source) (sinks: 0, sources: 1, priority: 20, available: yes)
		headset_audio_gateway: Headset Audio Gateway (HSP) (sinks: 1, sources: 1, priority: 10, available: no)
		handsfree_audio_gateway: Handsfree Audio Gateway (HFP) (sinks: 1, sources: 1, priority: 10, available: yes)
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
	Active Profile: handsfree_audio_gateway
	Ports:
		phone-output: Phone (type: Phone, priority: 0, latency offset: 0 usec, availability unknown)
			Part of profile(s): headset_audio_gateway, handsfree_audio_gateway
		phone-input: Phone (type: Phone, priority: 0, latency offset: 0 usec, availability unknown)
			Part of profile(s): a2dp_source, headset_audio_gateway, handsfree_audio_gateway
root@imx8mp-lpddr4-evk:/# pactl list sinks short
0	alsa_output.platform-sound-bt-sco.mono-fallback	module-alsa-card.c	s16le 1ch 16000Hz	RUNNING
1	alsa_output.platform-sound-tlv320aic31xx.stereo-fallback	module-alsa-card.c	s16le 2ch 48000Hz	RUNNING
6	bluez_sink.DC_C4_9C_37_BB_0D.handsfree_audio_gateway	module-bluez5-device.c	s16le 1ch 16000Hz	SUSPENDED
root@imx8mp-lpddr4-evk:/# pactl list sources short
0	alsa_output.platform-sound-bt-sco.mono-fallback.monitor	module-alsa-card.c	s16le 1ch 16000Hz	IDLE
1	alsa_input.platform-sound-bt-sco.mono-fallback	module-alsa-card.c	s16le 1ch 16000Hz	RUNNING
2	alsa_output.platform-sound-tlv320aic31xx.stereo-fallback.monitor	module-alsa-card.c	s16le 2ch 48000Hz	IDLE
3	alsa_input.platform-sound-tlv320aic31xx.stereo-fallback	module-alsa-card.c	s16le 2ch 48000Hz	RUNNING
15	bluez_sink.DC_C4_9C_37_BB_0D.handsfree_audio_gateway.monitor	module-bluez5-device.c	s16le 1ch 16000Hz	IDLE
16	bluez_source.DC_C4_9C_37_BB_0D.handsfree_audio_gateway	module-bluez5-device.c	s16le 1ch 16000Hz	SUSPENDED
root@imx8mp-lpddr4-evk:/# pactl list modules short
0	module-device-restore		
1	module-stream-restore		
2	module-card-restore		
3	module-augment-properties		
4	module-switch-on-port-available		
5	module-udev-detect	tsched=0	
6	module-alsa-card	device_id="1" name="platform-sound-bt-sco" card_name="alsa_card.platform-sound-bt-sco" namereg_fail=false tsched=no fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1"	
7	module-alsa-card	device_id="0" name="platform-sound-tlv320aic31xx" card_name="alsa_card.platform-sound-tlv320aic31xx" namereg_fail=false tsched=no fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1"	
8	module-bluetooth-policy		
9	module-bluetooth-discover	headset=auto	
10	module-bluez5-discover	headset=auto	
11	module-native-protocol-unix		
12	module-default-device-restore		
14	module-always-sink		
15	module-intended-roles		
16	module-suspend-on-idle		
17	module-position-event-sounds		
18	module-role-cork		
19	module-filter-heuristics		
20	module-filter-apply		
31	module-bluez5-device	path=/org/bluez/hci0/dev_DC_C4_9C_37_BB_0D autodetect_mtu=0 output_rate_refresh_interval_ms=500 avrcp_absolute_volume=1	
35	module-loopback	source=alsa_input.platform-sound-tlv320aic31xx.stereo-fallback sink=alsa_output.platform-sound-bt-sco.mono-fallback latency_msec=20	
36	module-loopback	source=alsa_input.platform-sound-bt-sco.mono-fallback sink=alsa_output.platform-sound-tlv320aic31xx.stereo-fallback latency_msec=20	
42	module-loopback	sink="bluez_sink.DC_C4_9C_37_BB_0D.handsfree_audio_gateway" sink_dont_move="true" source_output_properties="media.role=phone"	
43	module-loopback	source="bluez_source.DC_C4_9C_37_BB_0D.handsfree_audio_gateway" source_dont_move="true" sink_input_properties="media.role=phone"

We've adjusted hci command w.r.t UM11490 like below:

# 1. Enable PCM Line Management by the Host
hcitool -i hci0 cmd 0x3F 0x0070 0x01

# 2. Set SCO Voice Data Path Through PCM Interface
hcitool -i hci0 cmd 0x3F 0x001D 0x01

# 3. Write PCM Settings (Enable PCM Clock Continuously)
hcitool -i hci0 cmd 0x3F 0x0007 0x10

# 4. Configure PCM Sync Settings
hcitool -i hci0 cmd 0x3F 0x0028 0x03 0x00 0x03

# 5. Configure PCM Link Settings
hcitool -i hci0 cmd 0x3F 0x0029 0x04 0x00

# 6. Write Voice Settings (Set CVSD Codec)
hcitool -i hci0 cmd 0x03 0x0026 0x60 0x00

And below is our device tree for the pcm interface and codecs:

        sound-bt-sco {
                compatible = "simple-audio-card";
                simple-audio-card,name = "bt-sco-audio";
                simple-audio-card,format = "dsp_a";
                simple-audio-card,bitclock-inversion;
                simple-audio-card,frame-master = <&btcpu>;
                simple-audio-card,bitclock-master = <&btcpu>;

                btcpu: simple-audio-card,cpu {
                        sound-dai = <&sai2>;
                        dai-tdm-slot-num = <2>;
                        dai-tdm-slot-width = <16>;
                };

                simple-audio-card,codec {
                        sound-dai = <&bt_sco_codec 1>;
                };
        };
         sound-tlv320aic31xx {
                compatible = "simple-audio-card";
                simple-audio-card,name = "tlv320aic31xx-Codec";
                simple-audio-card,format = "i2s";
                simple-audio-card,frame-master = <&dailink_master>;//Which one is master
                simple-audio-card,bitclock-master = <&dailink_master>;//which one is master
                simple-audio-card,widgets =
                "Speaker", "External Speaker",
                "Headphone", "Headphone Jack",
                "Microphone", "Mic Jack";
                simple-audio-card,routing =
                "External Speaker", "SPK",
                "Headphone Jack", "HPL",
                "Headphone Jack", "HPR",
                "Mic Jack", "MIC1RP";
                dailink_master:simple-audio-card,cpu {
                        sound-dai = <&sai3>;
                };
                simple-audio-card,codec {
                        sound-dai = <&tlv320aic3100>;
                        system-clock-frequency = <12288000>;
                };
        };

&sai2 {
        #sound-dai-cells = <0>;
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_sai2>;
        assigned-clocks = <&clk IMX8MP_CLK_SAI2>;
        assigned-clock-parents = <&clk IMX8MP_AUDIO_PLL1_OUT>;
        assigned-clock-rates = <12288000>;
        status = "okay";
};

&sai3 {
        #sound-dai-cells = <0>;
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_sai3>;
        assigned-clocks = <&clk IMX8MP_CLK_SAI3>;
        assigned-clock-parents = <&clk IMX8MP_AUDIO_PLL1_OUT>;
        assigned-clock-rates = <12288000>;
        clocks = <&audio_blk_ctrl IMX8MP_CLK_AUDIO_BLK_CTRL_SAI3_IPG>, <&clk IMX8MP_CLK_DUMMY>,
                 <&audio_blk_ctrl IMX8MP_CLK_AUDIO_BLK_CTRL_SAI3_MCLK1>, <&clk IMX8MP_CLK_DUMMY>,
                 <&clk IMX8MP_CLK_DUMMY>;
        clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";
        fsl,sai-mclk-direction-output;
        status = "okay";
};

So we have few questions:

• Are our loopback routings for HFP are correct?
• Do HFP uses pcm and A2DP use uart in terms of data transmission is this correct?
• Are hci commands to prepare the module for PCM transmissions are correct?
• What could be the issue for our case?

Best Regards,

[JorgeCas]

Hello,

Are our loopback routings for HFP are correct?

Yes, according to the documentation, those are the correct settings.

Do HFP uses pcm and A2DP use uart in terms of data transmission is this correct?

Yes, according to internal team A2DP protocol works on UART and HSP/HFP works on PCM interface.

Are hci commands to prepare the module for PCM transmissions are correct?

Yes, that is correct.

What could be the issue for our case?

Some debugging options are:

Verify that your Bluetooth headset is connected and using HFP

bluetoothctl info XX:XX:XX:XX:XX:XX

Your routing is correct but, please confirm the default Bluetooth sink:

pactl list sinks short
pactl set-default-sink <sink-name>

Best regards.